os/mac/pkgconfig: delete most cflags on 10.14+

Library/Homebrew/os/mac/pkgconfig/10.14/libcurl.pc

@@ -37,4 +37,4 @@ Description: Library to transfer files with ftp, http, etc.
 Version: 7.54.0
 Libs: -L${libdir} -lcurl
 Libs.private: -lldap -lz
-Cflags: -I${includedir}
+Cflags:

Library/Homebrew/os/mac/pkgconfig/10.14/libexslt.pc

@@ -10,4 +10,4 @@ Version: 0.8.17
 Description: EXSLT Extension library
 Requires: libxml-2.0
 Libs: -L${libdir} -lexslt -lxslt  -lxml2 -lz -lpthread -licucore -lm
-Cflags: -I${includedir}
+Cflags:

Library/Homebrew/os/mac/pkgconfig/10.14/libxml-2.0.pc

@@ -2,7 +2,7 @@ homebrew_sdkroot=/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk
 prefix=${homebrew_sdkroot}/usr
 exec_prefix=/usr
 libdir=${exec_prefix}/lib
-includedir=${prefix}/include
+includedir=${prefix}/include/libxml2
 modules=1
 
 Name: libXML
@@ -11,4 +11,4 @@ Description: libXML library version2.
 Requires:
 Libs: -L${libdir} -lxml2
 Libs.private: -lz -lpthread -licucore -lm
-Cflags: -I${includedir}/libxml2
+Cflags: -I${includedir}

Library/Homebrew/os/mac/pkgconfig/10.14/libxslt.pc

@@ -10,4 +10,4 @@ Version: 1.1.29
 Description: XSLT library version 2.
 Requires: libxml-2.0
 Libs: -L${libdir} -lxslt  -lxml2 -lz -lpthread -licucore -lm
-Cflags: -I${includedir}
+Cflags:

Library/Homebrew/os/mac/pkgconfig/10.14/sqlite3.pc

@@ -9,4 +9,4 @@ Description: SQL database engine
 Version: 3.24.0
 Libs: -L${libdir} -lsqlite3
 Libs.private:
-Cflags: -I${includedir}
+Cflags:

Library/Homebrew/os/mac/pkgconfig/10.14/uuid.pc

@@ -3,7 +3,7 @@ prefix=${homebrew_sdkroot}/usr
 exec_prefix=/usr
 libdir=${exec_prefix}/lib
 sharedlibdir=${libdir}
-includedir=${prefix}/include
+includedir=${prefix}/include/uuid
 
 Name: uuid
 Description: Universally unique id library
@@ -11,4 +11,4 @@ Version: 1.0
 
 Requires:
 Libs:
-Cflags: -I${includedir}/uuid
+Cflags: -I${includedir}

Library/Homebrew/os/mac/pkgconfig/10.14/zlib.pc

@@ -11,4 +11,4 @@ Version: 1.2.11
 
 Requires:
 Libs: -L${libdir} -L${sharedlibdir} -lz
-Cflags: -I${includedir}
+Cflags:

Library/Homebrew/os/mac/pkgconfig/10.15/libcurl.pc

@@ -37,4 +37,4 @@ Description: Library to transfer files with ftp, http, etc.
 Version: 7.64.1
 Libs: -L${libdir} -lcurl
 Libs.private: -lldap -lz
-Cflags: -I${includedir}
+Cflags:

Library/Homebrew/os/mac/pkgconfig/10.15/libexslt.pc

@@ -10,4 +10,4 @@ Version: 0.8.17
 Description: EXSLT Extension library
 Requires: libxml-2.0
 Libs: -L${libdir} -lexslt -lxslt  -lxml2 -lz -lpthread -licucore -lm
-Cflags: -I${includedir}
+Cflags:

Library/Homebrew/os/mac/pkgconfig/10.15/libxml-2.0.pc

@@ -11,4 +11,4 @@ Description: libXML library version2.
 Requires:
 Libs: -L${libdir} -lxml2
 Libs.private: -lz -lpthread -licucore -lm
-Cflags: -I${includedir}/libxml2
+Cflags:

Library/Homebrew/os/mac/pkgconfig/10.15/libxslt.pc

@@ -10,4 +10,4 @@ Version: 1.1.29
 Description: XSLT library version 2.
 Requires: libxml-2.0
 Libs: -L${libdir} -lxslt  -lxml2 -lz -lpthread -licucore -lm
-Cflags: -I${includedir}
+Cflags:

Library/Homebrew/os/mac/pkgconfig/10.15/sqlite3.pc

@@ -9,4 +9,4 @@ Description: SQL database engine
 Version: 3.28.0
 Libs: -L${libdir} -lsqlite3
 Libs.private:
-Cflags: -I${includedir}
+Cflags:

Library/Homebrew/os/mac/pkgconfig/10.15/uuid.pc

@@ -3,7 +3,7 @@ prefix=${homebrew_sdkroot}/usr
 exec_prefix=/usr
 libdir=${exec_prefix}/lib
 sharedlibdir=${libdir}
-includedir=${prefix}/include
+includedir=${prefix}/include/uuid
 
 Name: uuid
 Description: Universally unique id library
@@ -11,4 +11,4 @@ Version: 1.0
 
 Requires:
 Libs:
-Cflags: -I${includedir}/uuid
+Cflags: -I${includedir}

Library/Homebrew/os/mac/pkgconfig/10.15/zlib.pc

@@ -11,4 +11,4 @@ Version: 1.2.11
 
 Requires:
 Libs: -L${libdir} -L${sharedlibdir} -lz
-Cflags: -I${includedir}
+Cflags: