Rename libpcre.wrap to pcre.wrap

It is exactly the same wrap as the one in WrapDB but with a different
name. That fix error when multiple projects uses pcre and they don't
have the same wrap name:

meson.build:1:0: ERROR: Multiple wrap files provide 'libpcre' dependency: pcre.wrap and libpcre.wrap

meson.build

@@ -1999,7 +1999,7 @@ endif
 
 # Try again with the fallback
 if not pcre.found()
-  pcre = dependency('libpcre', required : true, fallback : ['libpcre', 'pcre_dep'])
+  pcre = dependency('libpcre', required : true, fallback : ['pcre', 'pcre_dep'])
   use_pcre_static_flag = true
 elif host_system == 'windows'
   pcre_static = cc.links('''#define PCRE_STATIC

subprojects/pcre.wrap

@@ -9,3 +9,4 @@ patch_hash = 6b80f72385e1bf06721e26fbc83aced576e9c0d3182d86a55dd173a04050fe26
 
 [provide]
 libpcre = pcre_dep
+